Test Bank Chapter 23 Biochemistry Written By Lehninger.

Test Bank Chapter 23 Biochemistry
Written By Lehninger.
1. The radioimmunoassay (RIA) is based on competition of unlabeled and radiolabeled:



A) antibodies for binding to a hormone.

B) antibodies for binding to a receptor.

C) hormone for binding to a receptor.

D) hormone for binding to an antibody.

E) receptor for binding to a hormone. - Answer D



2. One distinction between peptide and steroid hormones is that peptide hormones:



A) act through nonspecific receptors, whereas steroid hormones act through specific receptors.

B) are generally water-insoluble, whereas steroid hormones are water soluble.

C) are more stable than steroid hormones.

D) bind to cell surface receptors, whereas steroid hormones bind to nuclear receptors.

E) bind to their receptors with high affinity, whereas steroid hormones bind with low affinity -
Answer D



3. Insulin is an example of a(n) ____________ hormone.



A) catecholamine

B) eicosanoid

C) paracrine

D) peptide

E) steroid - Answer D



4. The maturation of insulin from its precursor (preproinsulin) involves:



A) acetylation.

, 5. Epinephrine is an example of a(n) ____________ hormone.



A) catecholamine

B) eicosanoid

C) paracrine

D) peptide

E) steroid - Answer A



6. An example of an eicosanoid hormone is:



A) epinephrine.

B) retinoic acid.

C) testosterone.

D) thromboxane.

E) thyroxine - Answer D



7. An example of a steroid hormone is:



A) epinephrine.

B) retinoic acid.

C) testosterone.

D) thromboxane.

E) thyroxine - Answer C



8. Some hormones are derived from amino acids; for example, catecholamines are derived
from_____while NO is derived from________.



A) tyrosine; arginine

B) tryptophan; lysine

C) tyrosine; histidine